Re: 2.4.20: Proccess stuck in __lock_page ...

[manish (manish@storadinc.com)]

Marcelo Tosatti wrote:

> On Tue, 27 May 2003, manish wrote:
>
> > Marcelo Tosatti wrote:
> >
> > > On Tue, 27 May 2003, manish wrote:
> > >
> > > > Marc-Christian Petersen wrote:
> > > >
> > > > > On Tuesday 27 May 2003 20:33, Marcelo Tosatti wrote:
> > > > >
> > > > > Hi Marcelo,
> > > > >
> > > > > > It seems your "fix-pausing" patch is fixing a potential wakeup
> > > > > > miss, right? (I looked quickly throught it). Could you explain me the
> > > > > > problem its trying to fix and how?
> > > > > Please have also a look here:
> > > > >
> > > > > http://hypermail.idiosynkrasia.net/linux-kernel/archived/2002/week45/0305.html
> > > > >
> > > > > ciao, Marc
> > > > Hello !
> > > >
> > > > I applied the fix-pausing-2 patch to the 2.4.20 kernel. This time on,
> > > > the stack trace:
> > > >
> > > > sys_write
> > > > generic_file_write
> > > > ext2_get_group_desc
> > > > bread
> > > > __wait_on_buffer
> > > > schedule
> > > Huh? You mean bonnie still deadlocks or ?
> > At the time the processes get stuck:
> >
> >
> > [root@dyn-10-123-130-235 vm]# more /proc/meminfo
> >        total:    used:    free:  shared: buffers:  cached:
> > Mem:  3709870080 3699126272 10743808        0 18313216 3531255808
> > Swap: 1077501952        0 1077501952
> > MemTotal:      3622920 kB
> > MemFree:         10492 kB
> > MemShared:           0 kB
> > Buffers:         17884 kB
> > Cached:        3448492 kB
> > SwapCached:          0 kB
> > Active:          25252 kB
> > Inactive:      3445344 kB
> > HighTotal:     2752512 kB
> > HighFree:         2120 kB
> > LowTotal:       870408 kB
> > LowFree:          8372 kB
> > SwapTotal:     1052248 kB
> > SwapFree:      1052248 kB
>
> Ok, so just to confirm: You're still getting pauses with Andrea's patches
> but no hangs anymore?
>
> Correct?
Hi Marcelo,

I have applied Andrea's patch to two kernels:

1. Stock 2.4.20
2. 2.4.20 with the io_request_lock removed.

The tests on the first one are still going. The tests on the second one 
showed processes getting stuck for long times (> 5 minutes) and not 
paused ...

Thanks
Manish



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